There are a number of ways you can customize the look of your Facebook shop. First, from your Dashboard, navigate to Facebook Shop -> Customization. Then just decide what you want to change!
Changing your logo for your Facebook shop is easy. Simply double click the grey camera image, upload the logo you want to use, and then double click on it when it appears in the Image Manager. If you have previously uploaded your logo to your Image Manager, all you have to do is double click it.
You can also easily change the theme of your Facebook shop. Select the theme you would like to use from the drop down menu labeled "Facebook Template". A preview of the theme will appear below, so you can be sure that's the one you want to go with before applying it to your store.
MiiDuu also lets you customize a banner for your store with either text or images. In the space below where you can customize your theme, you can type in whatever text you would like displayed, or insert a banner image. To insert an image, click on the button that has the picture of the house and then where it asks for the URL, click browse. This will take you to your image manager where you can either select a photo you have already uploaded or upload a new one.